A Microsoft ergonomic keyboard costs about $130.

A special ergonomic mouse -- the kind a couple of my colleagues had on medical advice after some RSI issues -- costs almost $500.

For vanity, see the standard Apple keyboard, which costs about $200.

Do you mind naming the mice your colleagues are using?

RollerMouse: https://contour-design.co.uk/products/centred-mice/

Where is the split, mechanical, symmetrical ortholinear with customizable firmware and thumb clusters that costs meaningfully less than that?

I wound up on the ErgoDox EZ due to wrist and arm pain that it helped significantly.

All of those features contributed to the pain reduction, as far as I can tell (based on the slow series of keyboard changes I went through).

This is not a rhetorical question - if there's a significantly cheaper option that meets my needs, I want to know.